結果
| 問題 | No.1371 交換門松列・松 |
| ユーザー |
 hitonanode
|
| 提出日時 | 2021-01-29 22:04:18 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 80 ms / 4,000 ms |
| コード長 | 6,192 bytes |
| コンパイル時間 | 1,945 ms |
| コンパイル使用メモリ | 202,272 KB |
| 最終ジャッジ日時 | 2025-01-18 09:14:40 |
|
ジャッジサーバーID （参考情報） |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 29 |
ソースコード
#include <bits/stdc++.h>using namespace std;using lint = long long;using pint = pair<int, int>;using plint = pair<lint, lint>;struct fast_ios { fast_ios(){ cin.tie(nullptr), ios::sync_with_stdio(false), cout << fixed << setprecision(20); }; } fast_ios_;#define ALL(x) (x).begin(), (x).end()#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)#define REP(i, n) FOR(i,0,n)#define IREP(i, n) IFOR(i,0,n)template <typename T, typename V>void ndarray(vector<T>& vec, const V& val, int len) { vec.assign(len, val); }template <typename T, typename V, typename... Args> void ndarray(vector<T>& vec, const V& val, int len, Args... args) { vec.resize(len), for_each(begin(vec), end(vec), [&](T& v) { ndarray(v, val, args...); }); }template <typename T> bool chmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; }template <typename T> bool chmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; }int floor_lg(long long x) { return x <= 0 ? -1 : 63 - __builtin_clzll(x); }template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }template <typename T> vector<T> sort_unique(vector<T> vec) { sort(vec.begin(), vec.end()), vec.erase(unique(vec.begin(), vec.end()), vec.end());return vec; }template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << '['; for (auto v : vec) os << v << ','; os << ']'; return os; }template <typename T, size_t sz> ostream &operator<<(ostream &os, const array<T, sz> &arr) { os << '['; for (auto v : arr) os << v << ','; os << ']';return os; }#if __cplusplus >= 201703Ltemplate <typename... T> istream &operator>>(istream &is, tuple<T...> &tpl) { std::apply([&is](auto &&... args) { ((is >> args), ...);}, tpl); returnis; }template <typename... T> ostream &operator<<(ostream &os, const tuple<T...> &tpl) { std::apply([&os](auto &&... args) { ((os << args << ','), ...);},tpl); return os; }#endiftemplate <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ','; os << ']'; return os;}template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }template <typename T, typename TH> ostream &operator<<(ostream &os, const unordered_set<T, TH> &vec) { os << '{'; for (auto v : vec) os << v << ',';os << '}'; return os; }template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os;}template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}';return os; }template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << '(' << pa.first << ',' << pa.second << ')';return os; }template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; }template <typename TK, typename TV, typename TH> ostream &operator<<(ostream &os, const unordered_map<TK, TV, TH> &mp) { os << '{'; for (auto v : mp)os << v.first << "=>" << v.second << ','; os << '}'; return os; }#ifdef HITONANODE_LOCALconst string COLOR_RESET = "\033[0m", BRIGHT_GREEN = "\033[1;32m", BRIGHT_RED = "\033[1;31m", BRIGHT_CYAN = "\033[1;36m", NORMAL_CROSSED = "\033[0;9;37m", RED_BACKGROUND = "\033[1;41m", NORMAL_FAINT = "\033[0;2m";#define dbg(x) cerr << BRIGHT_CYAN << #x << COLOR_RESET << " = " << (x) << NORMAL_FAINT << " (L" << __LINE__ << ") " << __FILE__ << COLOR_RESET <<endl#else#define dbg(x) (x)#endif// 0-indexed BIT (binary indexed tree / Fenwick tree) (i : [0, len))template <typename T> struct BIT {int n;std::vector<T> data;BIT(int len = 0) : n(len), data(len) {}void reset() { std::fill(data.begin(), data.end(), T(0)); }void add(int pos, T v) { // a[pos] += vpos++;while (pos > 0 and pos <= n) data[pos - 1] += v, pos += pos & -pos;}T sum(int k) const { // a[0] + ... + a[k - 1]T res = 0;while (k > 0) res += data[k - 1], k -= k & -k;return res;}T sum(int l, int r) const { return sum(r) - sum(l); } // a[l] + ... + a[r - 1]friend std::ostream &operator<<(std::ostream &os, const BIT &bit) {T prv = 0;os << '[';for (int i = 1; i <= bit.n; i++) {T now = bit.sum(i);os << now - prv << ',', prv = now;}return os << ']';}};int main() {int N;cin >> N;vector<int> A(N);cin >> A;for (auto &a : A) a--;vector<int> pos(N);REP(i, N) pos[A[i]] = i;BIT<int> bit(N + 1);vector<pint> lohi(N);vector<vector<int>> bg(N + 1), ed(N + 1);REP(i, N) {bool md = false;int lo = 0, hi = N;if (i == 0) {md = (A[i + 1] < A[i]);} else {md = (A[i - 1] < A[i]);}if (md) {hi = N;if (i) chmax(lo, A[i - 1] + 1);if (i + 1 < N) chmax(lo, A[i + 1] + 1);} else {lo = 0;if (i) chmin(hi, A[i - 1]);if (i + 1 < N) chmin(hi, A[i + 1]);}lohi[i] = make_pair(lo, hi);bg[lo].push_back(A[i]);ed[hi].push_back(A[i]);}dbg(lohi);lint ret = 0;REP(a, N) {for (auto b : bg[a]) {bit.add(b, 1);}for (auto b : ed[a]) {bit.add(b, -1);}auto [l, r] = lohi[pos[a]];ret += bit.sum(l, r);}cout << (ret - N) / 2 << '\n';}